JPH09213147A - Composite insulator tube with enhanced resistance against moisture permeation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite insulator tube whose resistance against moisture permeation is enhanced while the lightweight construction as one of the features of composite insulator tube is well maintained without enlarging the wall thickness of a hollow core member such as an FRP cylinder. SOLUTION: This insulator tube concerned is composed of a hollow core member 1 in cylindrical shape and a sheath 2 furnished on the periphery of the core member 1, wherein the core member 1 is formed from at least two cylindrical hollow members 1a, 1b which are fitted each other. The end parts of these hollow members 1a, 1b are joined together in the sealed condition with the aid of a gap member 4, and a space 5 is bounded by two adjoining hollow members 1a, 1b. A passage is provided in gap member 4 located at least at one end so that the space 5 can be put in communication with outside the composite insulator, and a moisture absorbing means is installed to absorb the moisture existing in the space 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite porcelain tube having improved moisture permeation resistance.

2. Description of the Related Art Composite porcelain pipe is used for gas insulation equipment, oil insulation equipment, etc. Generally, in gas insulation equipment, it is necessary to control the water content in the gas to 100-200 PPM or less, while In the immersion paper bushing, it is required to control the water content in oil to several tens PPM or less.
The composite porcelain tube is composed of a cylindrical hollow core member and a jacket formed of an insulating polymer material provided on the outer periphery of the core member, and the hollow core member is composed of an FRP cylinder or the like. Since the FRP cylinder has a certain degree of moisture permeability, it is necessary to take some measures so that the amount of water permeating into the porcelain insulator inner space, that is, the amount of moisture permeability is below a certain level.

Generally, the amount of moisture permeated through an FRP cylinder under a certain environment is proportional to the humidity and the elapsed time, while it is inversely proportional to the wall thickness of the FRP cylinder when the resin, the curing agent and the roving winding angle are constant. To do. Furthermore, in composite porcelain pipes affected by temperature, FR is required due to the required electrical and mechanical characteristics.
There is a minimum wall thickness required for the P cylinder. Conventionally, in view of such a point, the amount of moisture permeation into the porcelain tube is controlled within an allowable range by appropriately changing the wall thickness of the FRP cylinder.

[0003]

The composite porcelain tube is characterized by being lightweight and convenient for transportation and installation.
When the wall thickness of the P cylinder is increased, the lightness characteristic of the composite porcelain tube is lost. In addition, there is a limit to increasing the wall thickness of the FRP cylinder from the manufacturing aspect, and when a small allowable moisture permeation amount in the composite porcelain pipe is required, increasing the wall thickness in this manner will increase the permeability. In some cases it may be difficult to control the moisture content. If it is used without sufficiently reducing the amount of moisture permeability, the durable use period will be significantly shortened as compared with the case of a porcelain porcelain tube made of a material having no moisture permeability. That is, the life is reached when the predetermined permissible moisture permeability is exceeded.

In view of the above conventional problems, the present invention is FR
An object of the present invention is to provide a composite porcelain tube having improved moisture permeation resistance while maintaining the light weight characteristic of the composite porcelain tube without increasing the wall thickness of a hollow core member such as a P cylinder.

[0005]

In order to achieve the above object, a composite porcelain tube according to the first invention of the present application has the following constitution. That is, the composite porcelain tube of the present invention comprises a cylindrical hollow core member and an outer cover provided on the outer periphery of the core member, and the core member is formed by at least two cylindrical hollow members fitted to each other. Both ends of the hollow member are joined together in a sealed state via a gap member, and a space is defined between the hollow members adjacent to each other, and a passage is provided in the gap member located at at least one end. In addition, the passage is capable of communicating the space with the outside of the composite porcelain pipe, and dehumidifying means for dehumidifying the inside of the space is provided.

With this structure, the space between the adjacent cylindrical hollow members is sealed at the time of use, and a dehumidifying body is filled in the space, so that the gas in the space is dehumidified as appropriate to keep the amount of moisture permeated at all times. Can be kept within an allowable range. In order to achieve the above object, the composite porcelain tube of the second invention of the present application comprises a cylindrical hollow core member and an outer cover provided on the outer periphery of the core member, and at least 2 of the core members fitted together. Two cylindrical hollow members, and both end portions of the cylindrical hollow members are integrally joined in a sealed state via a gap member, and a sealed space is defined between adjacent cylindrical hollow members, and the space is formed. A dehumidifying means inside is provided. A dehumidifying agent such as silica gel can be used as the dehumidifying means, and the dehumidifying agent can be regenerated at any time.

With this structure, a dehumidifying means for dehumidifying gas is provided in a space sealed between the adjacent cylindrical hollow members at the time of use, and the space is filled with a dehumidifying body. Therefore, the amount of moisture permeation can be constantly suppressed within the allowable range. Note that, for example, when a dehumidifying agent such as silica gel is used as the dehumidifying means, depending on the life of the composite porcelain tube, the amount of moisture permeation through the hollow core member can be constantly kept within an allowable range during the life. Use a dehumidifying agent.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the composite porcelain tube according to the first aspect of the present invention constructed as described above, passages are provided in the gap members at both ends of the cylindrical hollow member, and a circulation passage is provided through the passages. It is also possible to dispose a circulation means in the circulation passage and to provide a dehumidifying agent in at least one of the passage and the circulation passage. By doing so, the amount of moisture permeation passing through the hollow core member can always be suppressed within the allowable range. The passage may be provided only in the gap member, or in some cases, it may be provided through a fitting to be attached to the ends of the gap member and the cylindrical hollow core member.

In the second composite porcelain tube of the present invention constructed as described above, the annular plate member may be arranged in the space to form a convection circulation path passing through both sides of the annular plate member. it can. With such a configuration, the temperature difference is utilized inside and outside in the radial direction formed in the space by the annular plate member, whereby the gas circulates through the convection circulation path, and the inside of the space Can be effectively dehumidified and the amount of moisture permeation through the hollow core member can be constantly suppressed within the allowable range. In the composite porcelain tube of the second invention of the present application, the dehumidifying agent may be filled in the entire sealed space between adjacent cylindrical hollow members, or may be provided in a part of the space. Further, the dehumidifying agent may be housed in the concave portion provided on the surface of the gap member facing the space.

A material such as an aluminum alloy can be used as the gap member constituting the composite porcelain tube of the present invention, and conventionally used materials can be used as the other members. That is, the cylindrical hollow member can be formed of FRP or the like, and the outer cover can be formed of a material such as silicone rubber or EPDM. The mounting bracket is made of a material such as aluminum alloy.

The composite porcelain tube of the present invention can be manufactured in the following manner. First, an outer cover made of silicone rubber or the like is formed on the outer circumference of the outermost cylindrical hollow member by casting and cured, and then the remaining cylindrical hollow member is fitted to the outermost cylindrical hollow member and then bonded. The mounting member and the gap member are hermetically joined to each end of these cylindrical hollow members by using an agent. At this time, depending on the desired configuration, a sealed space is formed between the adjacent cylindrical hollow members, or the space communicates with the outside of the composite porcelain tube by the passage provided in the gap member. At this time, a dehumidifying agent is placed in the space according to the desired configuration.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to embodiments specifically shown in the accompanying drawings. 1 to 3
Shows a preferred embodiment of the first invention of the present application. In FIG. 1, the hollow core member is composed of an outer cylindrical hollow member 1a and an inner cylindrical hollow member 1b made of two FRPs, and silicone rubber is cast and cured on the outer circumference of the outermost cylindrical hollow member 1a. A formed jacket 2 is provided. The outer cover is composed of a sheath portion 2a extending along the outer circumference of the outermost cylindrical hollow member 1a and a cap portion 2b provided at a predetermined interval. A fitting is attached to each end of the hollow core member using an adhesive, and the end is adhesively joined to the fitting between the outer cylindrical hollow member 1a and the inner cylindrical hollow member 1b. . A passage 6 is provided which connects the space 5 between the outer cylindrical hollow member 1a and the inner cylindrical hollow member 1b and the outside of the composite porcelain tube through the fittings 3 and 4. More specifically, the passage 6 has a passage 6a which is open on the surface facing the space 5 and extends in the longitudinal direction of the gap member 4 and which is open on the surface facing the surface, and an opening communicating with the latter opening of the passage 6a. And a passage 6b which is open to the outside of the composite porcelain through the fitting. In this embodiment, after the dehumidifying body such as SF6 is enclosed in the space 5, the passage 6 is blocked by a shielding means (not shown) to keep the space 5 in a sealed state. In the present embodiment, if necessary, the shielding means is released, the gas in the space 5 is replaced with a new dehumidifying body, or the gas filled in the space 5 is dehumidified, and then the inside of the space 5 is restored. Occlusion
Keep it sealed.

FIG. 2 shows still another embodiment of the present invention in which an abutment plate 7 having a passage 6c communicating with the opening is attached to the outside of the passage 6b of the mounting member and attached to the mounting member via 0-rings 8 and 9. 2 is a partial sectional view of the embodiment of FIG. The same or similar members as those of the composite porcelain tube of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. A circulation passage 10 is provided at the opening of the passage 6c to the outside of the composite porcelain pipe, and the dehumidifying agent and the circulation pump P are arranged in the circulation passage 10. The other end of the circulation passage 10 is connected to the passage 6c communicating with the space 5 at the other end of the composite porcelain insulator. A shielding means (not shown) is provided to connect / disconnect between the passage 6 and the circulation passage 10. When the gas in the space 5 is dehumidified, the shielding means is opened, and the passage 6 and the circulation passage 1 are released.
The gas in the space 5 is dehumidified by circulating the gas through a dehumidifying agent by driving the circulation pump P. After dehumidification, the shielding means is closed and the space 5 is kept sealed again.

In FIG. 3, the fitting and the gap member are adhered and joined to both ends of the hollow core member in an airtight state, and the space between the outer cylindrical hollow member and the inner cylindrical hollow member is constantly sealed. FIG. 4 is a partial cross-sectional view of the second embodiment of the present invention which is maintained at The same or similar members as those of the composite porcelain tube of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. FIG. 4A and FIG.
4B is a plan view of the gap member 12 as seen from the end face side facing the space 5 between the outer cylindrical hollow member 1a and the inner cylindrical hollow member 1b, and IV in FIG. 4A.
It is sectional drawing of the gap | interval member cut and seen by the b-IVb line.
In FIG. 3, the mounting member 11 and the gap member 12 are adhered and joined to both ends of the hollow core member 1 in an airtight state, and a surface is provided in a space 5 between the outer cylindrical hollow member 1a and the inner cylindrical hollow member 1b. A dehumidifying agent 13 is filled and stored on the end surface side of the gap member 12 that is formed. That is, a plurality of blind holes 14 (8 in this embodiment) are formed on the end surface of the gap member 12, and the dehumidifying agent 13 is filled in the blind holes 14. The size and number of blind holes and the type and amount of dehumidifier are
It is selected and determined with reference to the target service life of the composite porcelain tube, the permissible amount of moisture permeation, etc. In this embodiment, the space 5 between the outer cylindrical hollow member 1a and the inner cylindrical hollow member 1b, which are always sealed, is kept at an allowable moisture permeation amount until the life of the composite porcelain tube is reached, and the hollow core member is kept. The amount of moisture permeation inside can be suppressed within an allowable range.

FIG. 5 is an embodiment of the present invention in which an annular plate member is further arranged in the space between the outer cylindrical hollow member and the inner cylindrical hollow member in the embodiment shown in FIGS. 3 to 4 (b). Is. The annular plate member 15 extends to the vicinity of the dehumidifying agent 13 located on the end faces of the gap members 12 located at both ends, and is supported by the support member 16 inside the space 5 and in the outer cylindrical hollow member 1a and the inner cylindrical hollow member. It is held at a position separated from 1b. Due to the annular plate member 15, the inside of the space 5 has an inner annular space portion 17a and an outer annular space portion 17b.
However, the temperature of the inner annular space 17a becomes higher than the temperature of the outer annular space 17b due to the heat generated by the conductive member disposed inside the cylindrical core member of the composite porcelain pipe, Convection occurs between the outer annular space 17b and the openings at both ends of the annular plate member 15. That is, the convection circulation passage 17 is formed inside the space 5 between the inner annular space portion 17a and the outer annular space portion 17b through the openings at both ends of the annular plate member 15. With this configuration, the gas in the space 5 is returned to the vicinity of the dehumidifying agent by flowing back in the convection circulation path 17 based on the temperature difference between the inner annular space portion 17a and the outer annular space portion 17b. The effect that dehumidification is performed more effectively is obtained.

FIG. 6 shows still another embodiment of the present invention in which the arrangement of the dehumidifying agent of the embodiment of FIG. 5 is modified. That is, in the embodiment of FIG. 5, the dehumidifying agent is filled and accommodated with the blind hole 14 dehumidifying agent 13 which opens to the end surface of the gap member 12, but in the embodiment of FIG. An annular plate member 15 so as to straddle the convection circulation path 17 by means.
Holding. By doing this, the space 5
Since the gas inside is forcedly passed near the dehumidifying agent 13 by convection, the gas can be dehumidified more effectively.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a preferred embodiment of the first invention of the present application.

FIG. 2 is a still further embodiment of the present invention in which an abutment plate 7 having a passage 6c communicating with an opening is attached to the outside of the passage 6b of the fitting, and is attached to the fitting via the 0-rings 8 and 9. FIG.

FIG. 3 is a book in which a mounting member and a gap member are adhered and joined to both ends of a hollow core member in an airtight state so that a space between an outer cylindrical hollow member and an inner cylindrical hollow member is constantly sealed. It is a partial cross section figure of another Example of an invention.

4 (a) and 4 (b) are plan views of the gap member 12 as viewed from the end face side facing the space 5 between the outer cylindrical hollow member 1a and the inner cylindrical hollow member 1b. 4A and 4B are cross-sectional views of the gap member taken along line IVb-IVb of FIG.

FIG. 5 is a partial cross-sectional view of an embodiment in which an annular plate member is arranged in a space between an outer cylindrical hollow member and an inner cylindrical hollow member.

FIG. 6 is a cross-sectional view of a portion of still another embodiment of the present invention in which the arrangement of the dehumidifying agent of the embodiment of FIG. 5 is modified.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical core member, 1a ... Outer cylindrical hollow member, 1b ... Inner cylindrical hollow member, 2 ... Outer sheath, 3
... Mounting hardware, 4 ... Gap member, 5 ... Space,
6 ... passage, 7 ... contact member, 8, 9 ... 0-ring, 10 ... circulation passage, 11 ... mounting bracket, 1
2 ... Gap member, 13 ... Dehumidifying agent, 14 ... Blind hole, 15 ... Annular plate member, 16 ... Support member, 1
7 ... Convection circulation path, 17a ... Inner annular space 17
b ... Outer annular space

Claims (5)

[Claims] 1. A cylindrical hollow core member and an outer cover provided on the outer periphery of the core member, wherein the core member is formed by at least two cylindrical hollow members fitted to each other. Both ends are integrally joined in a sealed state via a gap member, and a space is defined between the cylindrical hollow members adjacent to each other, and a passage is provided in the gap member located at at least one end, and the passage is provided. A composite porcelain tube characterized in that the space can communicate with the outside of the composite porcelain, and dehumidifying means for dehumidifying the interior of the space is provided. 2. A passage is provided in the gap member at both ends of the cylindrical hollow member, and a circulation passage is provided through the passage,
2. The composite porcelain tube according to claim 1, wherein a circulation means is arranged in the circulation passage, and a dehumidifying agent is provided in at least one of the passage and the circulation passage. 3. A cylindrical hollow core member and an outer cover provided on the outer periphery of the core member, wherein the core member is formed by at least two cylindrical hollow members fitted to each other. A composite porcelain tube in which both end portions are integrally joined in a sealed state through a gap member, a sealed space is defined between adjacent cylindrical hollow members, and dehumidifying means is provided in the space. 4. The composite porcelain tube according to claim 1, wherein the dehumidifying means is a dehumidifying agent arranged in the space. 5. The composite porcelain tube according to claim 1, wherein the annular plate member is arranged in the space to form a convection circulation path passing through both sides of the annular plate member.